Bipolar disorder is a mental health condition that affects your moods, which can swing from one extreme to another. It used to be known as manic depression.People with bipolar disorder have episodes of:

depression – feeling very low and lethargic

mania – feeling very high and overactive

depend on which mood you're experiencing.

Symptoms of bipolar disorder. Unlike simple mood swings, each extreme episode of bipolar disorder can last for several weeks (or even longer), and some people may not experience a "normal" mood very often.

Depression You may initially be diagnosed with clinical depression before you have a manic episode (sometimes years later), after which you may be diagnosed with bipolar disorder.During an episode of depression, you may have overwhelming feelings of worthlessness, which can potentially lead to thoughts of suicide.If you're feeling suicidal, go to your nearest A&E department as soon as possible. If you're feeling very depressed, contact your GP, care co-ordinator or local mental health crisis team as soon as possible. You could also call NHS 111 for an immediate assessment.ManiaDuring a manic phase of bipolar disorder, you may:

feel very happy

have lots of energy, ambitious plans and ideas

spend large amounts of money on things you cannot afford and would not normally want

It's also common to:

not feel like eating or sleeping

talk quickly

become annoyed easily

You may feel very creative and view the manic phase of bipolar as a positive experience. But you may also experience symptoms of psychosis, where you see or hear things that are not there or become convinced of things that are not true.

Living with bipolar disorderThe high and low phases of bipolar disorder are often so extreme that they interfere with everyday life.But there are several options for treating bipolar disorder that can make a difference. They aim to control the effects of an episode and help someone with bipolar disorder live life as normally as possible.The following treatment options are available:

medicine to prevent episodes of mania and depression – these are known as mood stabilisers, and you take them every day on a long-term basis

medicine to treat the main symptoms of depression and mania when they happen

learning to recognise the triggers and signs of an episode of depression or mania

psychological treatment – such as talking therapy, which can help you deal with depression, and provides advice about how to improve your relationships

It's thought using a combination of different treatment methods is the best way to control bipolar disorder.Help and advice for people with a long-term condition or their carers is also available from charities, support groups and associations.This includes self-help and learning to deal with the practical aspects of a long-term condition.Find out more about living with bipolar disorderBipolar disorder and pregnancyBipolar disorder, like all other mental health problems, can get worse during pregnancy. But specialist help is available if you need it.Find out more about bipolar disorder in pregnancyWhat causes bipolar disorder?The exact cause of bipolar disorder is unknown, although it's believed a number of things can trigger an episode.These include:

extreme stress

overwhelming problems

life-changing events

genetic and chemical factors

Who's affectedBipolar disorder is fairly common, and 1 in every 100 people will be diagnosed with it at some point in their life.Bipolar disorder can occur at any age, although it often develops between the ages of 15 and 19 and rarely develops after 40. Men and women from all backgrounds are equally likely to develop bipolar disorder.The pattern of mood swings in bipolar disorder varies widely. For example, some people only have a couple of bipolar episodes in their lifetime and are stable in between, while others have many episodes.Bipolar disorder and drivingIf you have bipolar disorder, it may affect your driving. You must inform the Driver and Vehicle Licensing Agency (DVLA).